diff options
Diffstat (limited to 'src/devices/bus/vic20/4cga.cpp')
-rw-r--r-- | src/devices/bus/vic20/4cga.cpp | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/devices/bus/vic20/4cga.cpp b/src/devices/bus/vic20/4cga.cpp new file mode 100644 index 00000000000..67901823065 --- /dev/null +++ b/src/devices/bus/vic20/4cga.cpp @@ -0,0 +1,113 @@ +// license:BSD-3-Clause +// copyright-holders:smf +/********************************************************************** + + Classical Games/Protovision 4 Player Interface emulation + + http://www.protovision-online.com/hardw/4_player.htm + http://hitmen.c02.at/html/hardware.html + +**********************************************************************/ + +#include "4cga.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_4CGA = &device_creator<c64_4cga_device>; + + +static INPUT_PORTS_START( c64_4player ) + PORT_START("JOY3") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_0) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_1) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_2) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_3) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_h) + PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED ) + + PORT_START("JOY4") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_0) + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_1) + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_2) + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_3) + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_j) + PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED ) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor c64_4cga_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( c64_4player ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_4cga_device - constructor +//------------------------------------------------- + +c64_4cga_device::c64_4cga_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_4CGA, "C64 Protovision 4 Player Interface", tag, owner, clock, "c64_4cga", __FILE__), + device_pet_user_port_interface(mconfig, *this), + m_port(0), + m_joy3(0xf), + m_joy4(0xf) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_4cga_device::device_start() +{ + // state saving + save_item(NAME(m_port)); +} + +//------------------------------------------------- +// update_output +//------------------------------------------------- + +void c64_4cga_device::update_output() +{ + UINT8 data; + + if (m_port) + { + data = m_joy3; + } + else + { + data = m_joy4; + } + + output_c((data>>0)&1); + output_d((data>>1)&1); + output_e((data>>2)&1); + output_f((data>>3)&1); +} + + +//------------------------------------------------- +// c64_pb_w - port B write +//------------------------------------------------- + +WRITE_LINE_MEMBER( c64_4cga_device::input_l ) +{ + m_port = state; + update_output(); +} |